Case: Zandkasteel – from 2.7 to 1.4 million kWh / year
How optimizing climate (S) led to lower energy costs (E), higher ESG scores, and happier tenants (S)
–1.3 million kWh per year
Significantly lower operating costs
Higher ESG performance (BREEAM, CRREM, Fitwel)
Happier tenants through better comfort
The challenge
Zandkasteel building in Amsterdam faced:
- High energy use (2.7 million kWh per year)
-
An indoor climate that was too healthy → excessive ventilation and wasted energy
-
The need to demonstrate improved ESG performance for banks, tenants, and investors
Our approach
Step 1 – Measurement and data collection
- Monitoring of CO₂ levels, energy use, and comfort
- API connection with Blue Module’s software for real-time insights
- Submeters to pinpoint where energy was being consumed
Step 2 – Insights and reporting
- Benchmarked against CRREM, BREEAM, and Fitwel standards
- Tenant feedback via Spaceflow & Freesi Insights
- Combined hard data with user experience for a complete picture
Step 3 – Optimization
- CO₂-controlled ventilation in meeting rooms
- Building management system (BMS) active only when occupied
- Systems shut down at night and weekends
The results
- Energy use reduced to 1.4 million kWh
- Structural cost savings for the owner
- Stronger ESG performance → building closer to Paris Proof
- Happier tenants thanks to better comfort and involvement in the process
Robert Kohsiek, Director, Wonam
"Part of Blue Module’s approach is that, based on the insights, the building and its installations are actually examined in detail. It may seem like just a software package, but it is precisely this combination of technology and human involvement that makes the difference."
Ready to go Paris Proof, starting with the ‘S’?
The Zandkasteel proves that smart measurement, listening to users, and targeted optimization deliver a double win:
- Lower costs for owners
- Better quality for tenants
